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Old 10-15-2020, 01:16 PM   #1
GeoNV
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Member#: 518830
Join Date: Sep 2020
Chapter/Region: RMIC
Location: Colorado
Vehicle:
2009 WRX
dark grey metallic

Default Starting an EJ255 motor build for 2009 WRX

Hey all, I've acquires a 2009 WRX with no transmission or engine or exhaust. Long story short I then bought an EJ255 block and some D25 heads as well as a stock intake for it among other things.

I've built 9 motors before now ranging from Chevy big blocks to toyota 4 bangers and have decided to build this engine myself. I tore down the block and didn't see any major issues- It's at a machine shop now getting hot tanked and then they are going to measure it. When I measaured it myself I saw a bit more cylinder taper than I wanted, but I'm curious what the shop's measurements come back as. Based on that I'll decide next steps there.

My plan is to put some Manley pistons and eagle rods in it and reuse the stock crank.

I'm planning to use the stock headers with an aftermarket up pipe and either an 18g or 20g turbo with a custom catted turboback exhaust.

Planning to get some ID 1050's and do a FMIC.

Not really any questions yet, I've been trolling the board for years and have been reading all the FAQ's I can find. Appreciate everything that people have contributed here over the years.

*edit* I plan to daily drive it, autocross and some drag strip use. I bought a 2011 WRX 5 speed which I'm currently going through. I know it's not the ideal trans and I'll eventually frag it, but I'll cross that bridge when it happens. I'm aiming for about 350 whp and want the ability to go up from there if I get bored.
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Old 10-17-2020, 08:35 PM   #2
BuiltWRXFL
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Member#: 518888
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Default

1050s and FMIC with a blouch is fully capable of more than 350 we have a car like that doing 395whp on 93 on a mustang dyno

Consider a blast plate for the trans that should help it hold more than 300 torque
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Old 10-17-2020, 10:13 PM   #3
GeoNV
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Location: Colorado
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2009 WRX
dark grey metallic

Default

Thanks! I figured i could start a bit detuned and move up from there as I got bored! Iíve been debating whether the blast plates were worth it, Iíve read some stuff saying the case doesnít flex much and other people say it does. Whatís your experience?
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Old 10-22-2020, 03:29 PM   #4
saaiello21
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Join Date: May 2019
Chapter/Region: Tri-State
Location: Atglen PA
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2011 WRX
gray

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Quote:
Originally Posted by GeoNV View Post
Thanks! I figured i could start a bit detuned and move up from there as I got bored! Iíve been debating whether the blast plates were worth it, Iíve read some stuff saying the case doesnít flex much and other people say it does. Whatís your experience?
I did a good bit of research on those when I did my build last year and came to the conclusion that they are not much help. It will add some rigidity to the case, but will it help it from tearing third gear up? maybe. I would just save for 6speed and limit your tuning to under 400 to be safe until you can swap it. I am running 390 to the wheels 10,000 miles now and Trans is holding up fine.
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Old 10-22-2020, 07:10 PM   #5
Dreed_ruu
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So I was wondering can you use wrx intake manifolds on sti heads
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Old 10-23-2020, 11:48 AM   #6
GeoNV
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2009 WRX
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Quote:
Originally Posted by saaiello21 View Post
I did a good bit of research on those when I did my build last year and came to the conclusion that they are not much help. It will add some rigidity to the case, but will it help it from tearing third gear up? maybe. I would just save for 6speed and limit your tuning to under 400 to be safe until you can swap it. I am running 390 to the wheels 10,000 miles now and Trans is holding up fine.

That's good to know. I've heard rumor but can't find confirmation that the 2008-2014 5mt is stronger than the previous WRX trans as it's derived from the legacy GT style gears. Good to hear you are putting some real power down through it!
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